8DI 8DO Modbus RTU wireless PLC from Lensen--Wireless Communication on Tindie
Amazon.com: Vonets VAP11S-5G Mini WiFi Bridge Ethernet/Mini Repeater/WiFi Router/Industrial Signal Booster 5GHz with 2 RJ45 Ports/Antennas and USB/DC Powered for DVR Monitoring PLC Medical Device : Everything Else
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Wifi Module For Siemens S7-200 Smart Series Plc Programming, Convert Wired Ethernet To Wireless Wifi 100m - Instrument Parts & Accessories - AliExpress